Board hammer



March 31, 1931. w w CR|LEY 1,798,310

I BOARD HAMMER Filed July 16, 1928 3 Sheets-Sheet l Midam 3 0 m 0%;

ATTORNEY March 31, 1931. w, CRILIYIIY BOARD HAMMER Filed July 16, 1928 3 Sheets-Sheet A9 2 195 w v m 7 ga 3 29 W M2522 43. I

. 7 ATTORNEY6 March 1931- w. w. CRILEY B OARD HAMMER Filed July 16, 1928 3 Sheets-Sheet 3 INVENTOR W/JZZQWZ ZWC'FJ/ey ATTORNEY? Patented Mar. 31, 1931 UNITED STATES PATENT OFFICE WILLIAM W. v(.lRIlllIilY, OF CLEVELAND, OHIO, ASSIGNOR TO THE AJAX MANUFACTUR- ING GOMPAFIY OF EUCLID, OHIO, A CORPORATION OF OHIO BOARD HAMMER Application filed July 16, 1928. Serial No. 293.267.

. The present invention relates, as indicated,

to a board hammer, and more particularly to the driving and operating means therefor.

The primary object of the invention is, of course, to improve the general construction of hammers of this class; and the further objects of the invention will appear asithe description proceeds.

In the annexed drawings:

Fig. 1 is a front elevational view of the upper end of a hammer of the class described; Fig. 2 isa side elevation taken from the right ofFig. 1; Fig. 3 is a plan view thereof; Fig. 4 is an elevation of the adjusting eccentric housing forthe back roll; Fig. 5 is an end elevation of said housing as viewed from the right of Fig. 4; Fig. 6 is an elevation of the operating eccentric housing for the front roll Fig. 7 is an end elevation thereof as viewed from the right of Fig. 6; Fig. 8 is a plan view of a similar organization 1n which the driving gearsare differently arranged; and Fig. 9 is a side elevation as viewed from the right of Fig 8.

Referring more partioularlyto the drawings, the reference numeral 1 indicates the frame for the hammer, thelower portion of which is of usual construction, and consequently it has been deemed unnecessaryto illustrate the same. The hammer is provided with the usual friction rod 2 and roll adjusting rod 3 and the usual front roll 4 and back roll 5 for cooperation with the board 6 of the hammer.

Mounted upon the frame in a manner hereinafter to be described is an electric motor 7, the spindle 8 of which is connected to a drive shaft 9, ournalled in bearings 10 on the frame of the machine, through the medium of flexible couplings 11. j The drive shaft 9 carries a pinion 12 in mesh with a gear 13 keyed to an intermediate shaft 14 journalled in the frame of the hammer, and said shaft 14 also carries a pinion 15 spaced slightly from said gear 13.

In the same horizontal plane with the intermediate shaft 14 there is journalled in, the frame of the hammer, a second intermediate shaft 16 carrying a gear 17 in mesh with the gear 13, and a pinion 18 in the plane of the pinion 15, it being noted that said idler shaft 16 further carries a fly wheel 19.

It will be noted that the gears 13 and 17 are formed with the same pitch diameter and that the pinions 15 and 18 are likewise formed with the same pitch diameter. A gear 20 is keyed to a roll shaft 21 upon which is mounted the roll 5 and said gear meshes with the pinion 15. Similarly, a gear 22 is keyed to a roll shaft 23 upon which is mounted the roll 4, and said gear 22 meshes with said pinion 18. A pair of spaced journals 24 are formed on the front of the hammer frame and are boredato receive trunnions 25 and 26 projecting from the opposite ends of a housing 27. Said trunnions 25 and 26 are eccentrically bored as at 28, and projecting ends of the roll shaft 23 are journalled in said bores 28. A pair of spaced arms 29 project radially from the trunnion 26, and said arms are apertured as at 30 adjacent their free ends. It will be noted that the outermost of said arms 29 is carried at the extreme end of the trunnion 26, and that, as a result of this construction, the friction rod 2 may be formed without any bends such as are universally necessary in prior devices of this type with which I am familiar. A pin 30 is adapted to extend through said apertures 30 and through a sleeve 31 formed on the upper end of the friction rod 2 and received between said arms 29, whereby said friction rod is pivotally connected to said arms 29.

Similar journals are formed on the rear of the frame and are bored to receive trunnions 32 projecting from opposite ends of a similar 7 housing 33. The trunnions 32 are eccentrically bored as at 32, and theprojecting ends of the roll shaft 21 are journalled in said bores 32'.

A pair of spaced arms 34 projecting from the housing33 are apertured as at 35 adjacent their free ends for the reception of a pin similar to the pin 30 which extends through said bores and through a sleeve 36 formed on the upper end of the adjusting rod 3, whereby said adjusting rod is pivotally connected to said arms 34. It will thus be seen that reciprocation of the friction rod 2 will cause the roll 4 to be shifted toward or away from the board 6, and that reciprocation of the adjusting rod 3 will cause the roll 5 to be shifted toward or away from the board 6.

It is well known that the operation of a hammer of this type is necessarily accompanied by severe vibration, and it is as well known that severe vibration is highly detrimental to electric motors. As a consequence, the present invention contemplates the provision of a resilient mounting for the motor 7. Such resilient mounting is effected through the medium of a pair of projections 37 on the hammer frame, said projections being apertnred as at 38 adjacent their upper ends. A pin 39 passes through said apertures and through a sleeve 40 formed on or secured to one end of a platform 41, whereby said platform is hinged to the hammer frame. A. rod 42 is secured to each free corner of the platform 41 and extends downwardly therefrom and through a bore formed in a lug 43 provided on the hammer frame. A compression spring 44 is sleeved on said rod 42 adj acent its upper end and bears at its one end against the platform 41 and at its opposite end against an adjustable abutment 45. It

will be obvious that the spring 44 might be arranged to bear directly against the"upper surface of the lug 43, but that the illustrated arrangement is more desirable in that it provides for adjustment. An abutment, in the form of a nut 46 threaded on the lower end of the rod 42 is provided as a backing for one end of a second compression spring 47 sleeved on said rod 42 and hearing at its opposite end against the lug 43. Obviously, the motor 7 may be resiliently mounted on the hammer frame through other means. For instance, the motor might be secured to a plate secured to said frame against horizontal movement but free to move vertically to a limited eXtent, resilient means such as a rubber pad, wooden blocks, springs of various types, or other equivalent elements being interposed between said plate and said frame.

The operation of the device is believed to be perfectly clear, but a short description thereof may be considered desirable. The motor 7 is energized to drive the shaft 9 and pinion 12. Said pinion drives the intermediate shafts 14 and 16, through the gear 13 mounted on said shaft 14 and the gear 17 mounted on the shaft 16 and meshing with the gear 13. The pinions 15 and 18 being keyed to said shafts 14 and 16, respectively. will rotate to drive the gears 20 and 22 and roll shafts 21 and 23. Since the gears 26 and 22 are of the same pitch diameter, the rolls 4 and 5 will rotate at exactly the same peripheral speed.

Under normal conditions, the adjusting rod 3 is so set that the roll 5 is ust out of contact with the board 6, but close enough thereto so that, when the roll 4 is moved into contact with the board 6, said board is moved into contact with the roll 5. Presuming that the hammer is being held in its elevated position through the medium of the usual clamp mechanism, the roll 4 is likewise out of contact with the board 6, andthe rolls 4 and 5 are rotating idly. If, now, the clamp mechanism is tripped and the hammer is allowed to fall, the fall of the hammer, through the usual mechanism causes the friction rod'2 to be moved downwardly to swing the housing 27 in a counterclockwise direction as viewed in Fig. 2. Due to the eccentricity of the bores 28 with relation to the outer surfaces of the trunnions 25 and 26, the roll 4 will be moved transversely (i. 0., upon an are concentric with the external surfaces of said trunnions) into contact with the boa-rd 6, thus moving said board into contact with the roll 5. The rotation of the rolls 4 and 5 will, as usual, carry the board and the attached hammer to the elevated position where the same will be caught by the above mentioned clamp mechanism, at which time automatic means will elevate the friction rod 2 to move the roll 4 out ofcontact with the board 6. Obviously, the teeth of the pinions 15 and 18 and of the gears 20 and 22 are sufficiently long to permit the very slight radial movement of the gears 20 and 22 toward and away from the axes of the pinions 15 and 18 during the operation of the hammer, without materially affecting their meshing or driving efficiency.

When the board 6 becomes worn or compressed through operation of the machine, suitable mechanism associated with the lower end of the adjusting rod 3 may be operated to swing the housing 33 slightly about its axis to move the roll 5 slightly toward the board 6.

It will be clearly seen that the provision of the springs 44 and 47, or of equivalent resili ent means, will nicely cushion the motor 7 against the effects of the vibration of the frame 1 caused by the blows of the hammer.

Referring now to the modification disclosed in Figs 8 and 9, it will be seen that the frame 51 mounts on organization including a friction rod 52 and an adjusting rod 53 for operating the front roll 54 and the rear roll 55, respectively, said rolls being adapted to engage the board 56. A motor 57 is mounted upon said frame, and the spindle 58 thereof is connected with a drive shaft 59 by means of flexible couplings 61. Said drive shaft 59 is journalled in a portion 60 of the frame and carries a pinion 62 similar to the pinion 12 disclosed in Fig. 3. An intermediate gear 63 similar to the gear 13 is mounted upon a sh aft 64 which is j ournalled immediately below the shaft 59, and said shaft 64 also mounts a pinion 65 similar to the pinion 15. A. second intermediate shaft 66 is journalled in the same horizontal plane with the shaft 64 and mounts an intermediate gear 67 meshing with the gear 63 and having a pitch diameter equal to that of the gear 63. Said shaft 66 further mounts a pinion 68 having a pitch diameter equal to that of the pinion 65.

It will be noted that, whereas the pinion 12 in the modification disclosed in Figs. 1 to 7 meshes with the intermediate gear 13, while the shaft 16 mounts a fly wheel 19, in the present modification there is no fly wheel on the shaft 66, but the shaft 64 mounts a large and heavy gear 69 with which the pinion 62 meshes. As in the modification disclosed in Figs. 1 to 7, the present modification includes a roll gear 70 mounted upon the roll shaft 71 and a second roll gear 72 having a pitch diameter equal to that of the gear 70 mounted upon the roll shaft 73.

In all other respects, the modification disclosed in Figs. 8 and 9 is identical with that disclosed in Figs. 1 to 7, save that the provision of the large gear 69 raises the drive shaft 59 to a higher level and permits the use of a larger motor. Due to this fact, and to the increased difierence between the pitch diameters of the pinion 62 and the gear 69, the modification disclosed in Figs. 8 and 9 will obviously develop more power than will that disclosed in Figs. 1 to 7. The operation of the present modification is identical with that of the before described modification.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention 1. In a board hammer including a frame, driving means for said hammer comprising a motor mounted on said frame, a drive shaft journalled in said frame substantially in alignment with the spindle of said motor, a flexible coupling connecting said drive shaft to said spindle, a pinion on said drive shaft,

an intermediate shaft journalled in said frame, a gear on said intermediate shaft in mesh with said pinion, a. pinion on saidintermediate shaft, a second intermediate shaft journalled in said frame, a gear on said second intermediate shaft and meshing with said gear on said first intermediate shaft, a pinion on said second intermediate shaf', journals in said frame, trunnions mounted in said journals, rotatable shafts eccentrically mounted in said trunnions and rolls mounted on said shafts, a gear on each of said roll shafts, each of said roll shaft gears meshing with one of said intermediate shaft pinions.

2. In a board hammer including a frame, driving means for said hammer comprising a motor mounted on said frame, a drive shaft journalled in said frame substantially in alignment with the spindle of said motor, a flexible coupling connecting said drive shaft to said spindle, a pinion on said drive shaft, an interme diateshaft j ourn alled in said frame below said drive shaft, a gear on said intermediate shaft in mesh with said pinion, a pinion on said intermediate shaft, a second intermediate shaft journalled'in said frame in the same horizontal plane with said first in termediate' shaft, a gear on said second inter mediate shaft andmeshing with said gear on said first intermediate shaft,a pinion on said second intermediate shaft, journals in said frame, trunnions mounted in said journals, rotatable shafts eccentrically mounted in said trunnions and rolls mounted on said shafts, said roll shafts being below said intermediate shafts, and a gear on each of said roll shafts, each of said roll shaft gears meshing with one of said intermediate pinions.

3. In a board hammer comprising a frame, a ram slidable in said frame, and a board secured to said ram, journals in said frame, trunnions mounted in said journals, shafts eccentrically mounted in said trunnions, rolls mounted on said shafts on opposite sides of said board and movable toward and away from said board, aroll gear on each of said roll shafts, intermediate shafts journalled in said frame adjacent each of said roll shafts, a pinion on each of said intermediate shafts, said pinions meshing with said roll gears,

respectively, a gear mounted on each of said intermediate shafts, said last-mentioned gears having equal pitch diameters and meshing with each other, and means for driving one of said intermediate shafts.

4. In a board hammer comprising a frame, a ram slidable in said frame, and a board secured to said ram, journals in said frame, trunnions mounted in said journals, shafts rotatably mounted in said trunnions and rolls mounted on said shafts on opposite sides of.

said board and movable toward and away from said board, a roll gear on each of said roll shafts, intermediate shafts journalled in said frame adjacent each of said roll shafts, a pinion on each of said intermediate shafts, said pinions meshing with said roll gears, respectively, a gear mounted on each of said intermediate shafts, said lastmentioned gears having equal pitch diameters and meshing with each other, a second gear on one of said intermediate shafts, a motor mounted on said frame, a drive shaft journalled in said frame and connected to the spindle of said motor, and a pinion on said last-mentioned shaft in mesh with said 1ast-mentioned gear. 7

5. In a board hammer comprising a frame, a ram slidable in said frame, and a board secured to said ram, journals in said frame, trunnions mounted in said ournals, shafts rotatably and eccentrically mounted in said trunnions and rolls mounted on said shafts, said rollsbeing mounted on opposite sides of said board and movable toward andaway from sai'dboand, a roll gear oneach ofszxid 111011-shazEts,-intenmediate shafts j'ournalled in said frame adjacent each of said r011 shafts, a pinion on-eachnf said intermediateshafts, =sn id pinions .meshing with said 1:011 gears, .repeotively, a gem .mounted on .each of said intermediatesha fts, said lastemenfiioned gem's meshing witheachothenand :meansfor driving (me of :said intermediate Shafts.

Signed :by me this 6th day of-July, .1928. WILLIAM CRILEY. 

